http://archive.freep.com/VideoNetwork/2842302856001/Dario-Franchitti-Announces-His-Retirementhttp://cdn.newslook.com/f0/f0d5c08302e43d6a62aff314d46c2a7e/mp4_low/f0d5c08302e43d6a62aff314d46c2a7e-mp4_low.mp4http://archive.freep.com/VideoNetwork/2842302856001/Dario-Franchitti-Announces-His-Retirementhttp://cdn.newslook.com/f0/f0d5c08302e43d6a62aff314d46c2a7e/images/frame_0026.jpgDario Franchitti Announces His RetirementFour-time IndyCar champion Dario Franchitti announced he will no longer be able to compete in auto racing because of injuries suffered in an Oct. 6 crash in Houston.9Ashley JuddhoustonsportsnewslookentertainmentDario Franchitti01:05